如何使两个对象具有可比性

Question

I'm passing objects of two different structs to a function where it's compared with an existing object saved as interface {} type.

In the following how can I make two objects comparable for Equality ===

In this attempt, comparison with bar works fine but with foo it throws a panic error in spite both objects are of struct type

Go Playground

package main

import "fmt"

type Foo struct {
    TestMethod func(str string)
}

type Bar struct {}

type IQux interface {
    Compare(object interface{}) bool
}

type Qux struct {
    Method func(str string)
    Reference interface{}
}

func (qux Qux) Compare(object interface{}) bool {
    return object == qux.Reference
}

func testMethod(str string) {
    fmt.Println(str)
}

func main() {
    foo := Foo{TestMethod:testMethod}
    bar := Bar{}

    ob := &Qux{Method: foo.TestMethod, Reference: foo}

    ob.Compare(bar) // works fine
    ob.Compare(foo) // panic: runtime error: comparing uncomparable type main.Foo
}

Answer 1

You have a little typo, just try:

package main

import "fmt"

type Foo struct {
    TestMethod func(str string)
}

type Bar struct {}

type IQux interface {
    Compare(object interface{}) bool
}

type Qux struct {
    Method func(str string)
    Reference interface{}
}

func (qux Qux) Compare(object interface{}) bool {
    return object == qux.Reference
}

func testMethod(str string) {
    fmt.Println(str)
}

func main() {
    foo := &Foo{TestMethod:testMethod}
    bar := Bar{}

    ob := Qux{Method: foo.TestMethod, Reference: foo}

    ob.Compare(bar) // works fine
    ob.Compare(foo) // panic: runtime error: comparing uncomparable type main.Foo
}